<!DOCTYPE html>
<html lang="zh">
	<head>
		<meta charset="utf-8">
		<link rel="stylesheet" href="style.css">
		<title>35 提示文字跳起来的输入框</title>
	</head>
	<body>
		<div class="app">
			<label class="label35">
				<input class="inp35" type="text" required>
				<span class="span35-box">
					<span class="span35-info">用</span>
					<span class="span35-info">户</span>
					<span class="span35-info">名</span>
				</span>
			</label>
		</div>
	</body>
</html>